_C_LABEL() and _ASM_LABEL() are no longer useful in the "everything
is ELF" world. Eliminate use of them in amd64, arm64, armv7, i386,
macppc, mips64, and sparc64 code.

ok deraadt@ jca@ krw@

Force 16 byte alignment in boot(8) srt0.S, since this is more likely to get
the required file offset (0x120) for the .text segment.

Dynamically build the Interrupt Descriptor Table (IDT), instead of using
a static table. This allows the IDT to be placed in .bss and avoids the
"relocation truncated" errors that result from the lin

Dynamically build the Interrupt Descriptor Table (IDT), instead of using
a static table. This allows the IDT to be placed in .bss and avoids the
"relocation truncated" errors that result from the linker trying to put
a 32-bit address into a 16-bit hole.

With input from Marco Peereboom.

ok weingart@

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das boot; das cloned das from das i386